Can anyone tell me what the "typical" TT length allowance is in most State/National Parks, for a trailer site? I've noticed that some only allow for a 30' TT, so if ours is longer (35') we'd have to use an RV site. Those are equipped with 50AMP electric, whereas our TT is 30AMP. Fixes?

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As stated the fix for the 50 to 30 amp is an adapter. I carry 3 different one and have used 2 before. Most state parks 35' isn't an issue, and on their reservation website you can input your TT size (at least in Washington State you can). As for National Parks many only allow 26' RV (again in Washington State). If you can fit in a 30' you can fit your 35' into most. I know for a couple of years our 33' Allegro fit into almost all sits we had. Tight, but doable.